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Polyclonal and monoclonal antibodies that recognize the 35-, 36-, and 37-kDa alternative oxidase proteins of Sauromatum guttatum (Schott) were used to isolate a cDNA clone, pAOSG81, from an S. guttatum cDNA expression library. A fusion protein with an apparent molecular mass of 48 kDa was expressed from a pUC119 derivative of pAOSG81 (pAOSG81-119) in Escherichia coli cells and was recognized by the monoclonal antibodies. When the in vitro translated and immunoprecipitated products made from mRNA hybrid-selected by pAOSG81 were analyzed, a single band corresponding to a protein with an apparent molecular mass of 42 kDa was observed. DNA sequence characterization showed that pAOSG81 contains the entire coding region of a protein with a calculated molecular mass of 38.9 kDa, a putative 63-amino acid transit peptide, and a 9-amino acid match to the authentic N-terminal sequence of the 36-kDa alternative oxidase protein. Analyses of the deduced amino acid sequence indicate: (i) that the transit peptide is predicted to form amphiphilic helices, and (ii) that three regions of the processed protein are likely to form transmembrane alpha-helices. We conclude from these data that pAOSG81 represents a nuclear gene, aox1, encoding a precursor protein of one or more of the alternative oxidase proteins of S. guttatum.

Isolation and characterization of a cDNA clone encoding an alternative oxidase protein of Sauromatum guttatum (Schott).